E-mail messages and other documents show that in his efforts to mitigate the fallout from an affair, Senator John Ensign entangled supporters, staff members and Senate colleagues and may have violated an ethics law.

The Senate Ethics Committee on Thursday asked the Justice Department to reopen its investigation of former Senator John Ensign, saying it had found evidence that he had conspired to help his former aide violate a lobbying ban, had broken campaign finance laws and had obstructed an investigation.

This week, John Harwood of CNBC and The New York Times discusses Chicago's failed bid to host the 2016 Olympics, recent revelations regarding Senator John Ensign, Republican of Nevada, and the continuing legislation to overhaul health care. (Video: MSNBC)